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Exp Ther Med. 2015 Sep;10(3):942-946. Epub 2015 Jun 23.

Association between low expression levels of interleukin-9 and colon cancer progression.

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Department of Gastroenterological Surgery, Cancer Center of Guangzhou Medical University, Guangzhou, Guangdong 510095, P.R. China.
Department of Colorectal and Anal Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China.


Although interleukin (IL)-9 has been extensively studied in inflammation and autoimmune diseases, the expression level of IL-9 in colon cancer and its clinical significance are less well established. In total, 15 healthy donors (HDs) and 60 patients who had been diagnosed with colon cancer that had undergone a surgical resection were enrolled in the study. The plasma levels of IL-9 in the HDs and cancer patients were detected by the liquid chip technique, while the expression levels of IL-9 in the colon cancer tissues and normal tissues were analyzed using immunohistochemistry (IHC) and reverse transcription-quantitative polymerase chain reaction (RT-qPCR). Finally, the difference in the expression levels of IL-9 between the patients classified as tumor-node-metastasis stage I-II and stage III-IV was compared. The results demonstrated that the plasma levels of IL-9 in the patients with colon cancer were significantly lower when compared with the HDs (1.29 vs. 2.53 pg/ml, P<0.05). Furthermore, according to the IHC and RT-qPCR results, low expression levels of IL-9 were observed in the colon cancer tissues when compared with the normal tissues (P<0.05). With regard to the plasma and tumor tissue samples, patients diagnosed with stage III-IV colon cancer expressed lower levels of IL-9 compared with the stage I-II patients (P<0.05). In conclusion, low expression levels of IL-9 were observed in the tissue and plasma samples collected from the colon cancer patients, and the decreased expression of IL-9 was shown to correlate with colon cancer progression.


colon cancer; interleukin-9; tumor-node-metastasis stage

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